压力袜压力与位移随着装时间变化的有限元模拟

Finite element simulation of relationship between pressure anddisplacement for pressure socks with time

紧身服装对人体产生的垂直于体表的内向位移是影响压力舒适性和进行服装结构优化的重要指标。本文以压力短袜为研究对象,针对目前压力袜袜口处存在的压力过大导致不舒适感或压力过小产生的易滑脱等压力分布不合理现象,将压力袜的着装过程分为6个时间段(瞬时,1、2、4、8、12 h),应用ANSYS有限元模拟6个时间段袜口处人体腿截面的位移形变。通过曲线拟合,得到6个时间段压力、位移和角度之间的函数关系。通过比较发现,“压力/位移—角度”函数曲线在任意时间点均呈现出几乎一致的变化趋势。即:当人体处于服装压力状态时,在已知压力值的前提下,可通过曲线方程计算人体的位移值。该方法解决了人体在压力作用下产生的位移值很难通过常规方法测量的弊端,为压力袜的舒适性研究及优化设计提供了理论参考。该方法同样适用于其他类型的紧身服装。

Pressure socks are one of the most widely used clothes in daily life.During the process of wearing,the function of pressure socks is closely related to pressure comfort.At present,most studies on pressure socks focus on the research of foot and ankle pressure,while there are few studies on the pressure at the top part of socks.The top part of socks is an important part that affects the comfort and functionality of pressure socks.The top part is easy to slip off when pressure is too small,and too large pressure will cause discomfort feeling to the wearer,and simultaneously bring negative effects to the body,even produce organ and tissue lesions.Therefore,the pressure socks should have an appropriate pressure distribution trend and pressure range.When the top part of socks exert pressure on the human body,the body will produce the corresponding inward displacement,and the displacement maybe vary in different positions.At the same time,the pressure and displacement of the human body at the top part of socks also show a changing tendency with the prolonging of dressing time.The inward displacement perpendicular to the body surface produced by compression clothing is an important index to evaluate pressure comfort and optimal design of tight clothing products.In-depth discussion of the relationship between pressure and displacement in the process of wearing tight clothing has certain reference significance for the evaluation of pressure comfort and the optimization and improvement of compression clothing structure.Pressure socks are taken as the research object in this study and the dressing process of pressure socks is divided into six periods of time(instantaneous and 1,2,4,8&12 h)in view of the unreasonable pressure distribution phenomenon that discomfort is caused due to excessive pressure or the socks are easy to slip due to too small pressure at the top part of pressure socks.ANSYS finite element software was used to simulate the displacement and deformation of the top part of socks cross section in six periods of time in this study.We finally obtained the functional relationship between pressure/displacement ratio and angle using curve fitting.It is found that the"pressure/displacement-angle"function curve shows an almost uniform trend at any point of time through comparison.That is to say,when the human body is in the state of clothing pressure,the corresponding displacement value of the human body can be calculated through the curve equation under the premise of known pressure value.The conclusions provide a theoretical reference for evaluating pressure comfort and optimizing clothing structure for the compression socks.This method is also applicable to other types of compression clothing.